Octameric cage structure

An octameric cage structure is found for the cobalt carbonyl cluster anchored silanetriol, Co3(CO)9CSi(OH)3 [25]. 

Thallium(I) thiolates form polymers, often with complex structures. Thus TlSPh is ionic and best described as [Tl7(SPh)6]+[Tl5(SPh)6], while TISBu is an octameric cage.58 Numerous anionic polychalcogenide complexes are known, such as [Tl2Te2]2 and [T12(S4)2]2 (6-XXV).59 As expected for a soft metal, Tl—chalcogenide bonds are strong and highly covalent. 

The tetrameric zinc anion [Zn4(//-ScPh)r,(ScPh)4]2 has been structurally characterized as the first example of a Zn4Se4 adamantane cage-type structure.594 A further example was characterized by Bochmann and co-workers as part of a study of polymetallic zinc selenophenolates, in this case with chlorides replacing the terminal selenophenolates, [Zn4(/u-SePh)6Cl4]. Octameric zinc species were also characterized with either chloride or phosphine ligands resulting in anionic and neutral complexes respectively, [Zn8(/x-SePh)12Cl4]2 and Zn8(yu-SePh)12(SePh)2 (P Pr3)2.301... 

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